Chap, ix.] THE NECK. 16? 



thorax are the axillary vein and its larger tributaries 

 When any one of these vessels is wounded, and the 

 wound is for the moment dry, air may very readily be 

 drawn into it during the inspiratory act, just as air is 

 drawn into the trachea. Nothing prevents this air 

 from being carried into the right auricle of the heart. 



The lymphatic glands in the neck are 

 very numerous, and are arranged in the following 

 sets : (1) Submaxillary (10 to 15), situate along the 

 base of the jaw beneath the cervical fascia ; (2) supra- 

 hyoid (1 or 2), situate about the middle line of the 

 neck between the chin and the hyoid bone ; (3) super- 

 ficial cervical (4 to 6), situate along the external 

 jugular vein beneath the platysma ; (4) deep cervical, 

 upper set (10 to 20), situate about the bifurcation of 

 common carotid, and along the upper part of the in- 

 ternal jugular vein ; (5) deep cervical, lower set (10 to 

 16), situate about the lower part of the internal 

 jugular vein, extending outwards into the supra- 

 clavicular fossa, and becoming continuous with the 

 axillary and mediasfcinal glands. 



These glands are veiy often enlarged and inflamed, 

 and it is in this part of the lymphatic system that the 

 changes in scrofula are most commonly met with. 

 The inflammatory affections in glands would appear 

 to be always of a secondary nature (if we exclude 

 some cases of inflammation incited by injury, and 

 perhaps by exposure to severe cold), and to follow 

 disturbances in those parts of the periphery whence 

 they respectively receive their lymph. It may be 

 convenient, therefore, to group the relations of certain 

 glands to certain parts of the periphery. 



Scalp. Posterior part = suboccipital and mas- 

 toid glands. Frontal and parietal portions = parotid 

 glands. 



Vessels from the scalp also enter the superficial 

 cervical set of glands. 



